Methods for preparation of olefins, including 8- and 11-unsaturated monoenes and polyenes, via transition metathesis-based synthetic routes are described. Metathesis reactions in the methods are catalyzed by transition metal catalysts including tungsten-, molybdenum-, and ruthenium-based catalysts. The olefins include insect pheromones useful in a number of agricultural applications.

Described herein is a catalytic reaction process including introducing one or more gas-phase reactants into a reactor comprising a microporous catalyst having a pore size less than or equal to 2 nm and adjusting the temperature and/or the pressure of the reactor such that one or more of the gas-phase reactants condense within the micropores of the catalyst thereby causing the catalytic reaction to take place in a liquid phase. Additionally, a process for engineering defects on a carboxylate-based metal organic framework (MOF) catalyst is described. The process includes providing a carboxylate-based MOF catalyst; and heating the carboxylate-based MOF catalyst in an inert gas atmosphere at temperatures between about 150° C. and about 900° C.

Cyclopentene monomers and methods of polymerization, including the polymerization of the cyclopentene monomers. The cyclopentene monomers include allylic substituted cyclopentene monomers that may be racemic or enantiopure. The methods of polymerization may permit the resulting polymers to have one or more desirable structural features.

Compositions and methods of capturing one or more nucleic acid molecules of a cell or subcellular compartment are described. In certain aspects, the compositions comprise a caged molecule comprising one or more photolinkers and an antisense oligonucleotide, which when uncaged hybridizes to a target nucleic acid molecule.

This invention relates generally to olefin metathesis catalysts, to the preparation of such compounds, compositions comprising such compounds, methods of using such compounds, and the use of such compounds in the metathesis of olefins and in the synthesis of related olefin metathesis catalysts. The invention has utility in the fields of catalysis, organic synthesis, polymer chemistry, and in industrial applications such as oil and gas, fine chemicals and pharmaceuticals.

The present invention relates to the use of specific catalysts for the metathesis degradation of nitrile rubber (NBR).

The invention further relates to a method for preparing nitrile rubber with reduced molecular weight using specific catalysts.

An organometallic complex catalyst that makes it possible to obtain a higher yield of a desired product than conventional catalysts in a cross-coupling reaction. The organometallic complex catalyst has a structure represented by formula (1) and is for use in a cross-coupling reaction. In formula (1), M is the coordination center and represents a metal atom such as Pd or an ion thereof. R1, R2, and R3 may be the same or different and are a substituent such as a hydrogen atom. R4, R5, R6, and R7 may be the same or different and are a substituent such as a hydrogen atom. X represents a halogen atom. R8 represents a substituent that has a π bond and 3-20 carbon atoms. With regard to the electron-donating properties of R1-R7 with respect to the coordination center M of the ligand containing R1-R7 that is indicated in formula (2), R1-R7 are arranged in combination such that the TEP value obtained from infrared spectroscopy shifts toward the low frequency side compared to the TEP value of the ligand of formula (2-1). ##STR00001##

This invention relates generally to olefin metathesis catalyst compounds, to the preparation of such compounds, compositions comprising such compounds, methods of using such compounds, articles of manufacture comprising such compounds, and the use of such compounds in the metathesis of olefins and olefin compounds. The invention has utility in the fields of catalysts, organic synthesis, polymer chemistry, and industrial and fine chemicals industry.

The invention discloses a tetramethyl-7,7′-spirobiindane-based phosphinooxazoline ligand compound and its preparation method and use. The phosphinooxazoline ligand compound is a compound having a structure shown in general formula I or an enantiomer, a raceme or a diastereoisomer thereof. The phosphinooxazoline ligand obtained through a series of reaction steps using cheap and easily available 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-6,6′-diol as a starting material. The novel phosphinooxazoline ligand developed in the invention can be used to organic catalytic reactions, especially as a chiral phosphinooxazoline ligand widely used in metal-asymmetric catalytic reactions, having economical practicality and industrial application prospects. ##STR00001##

Disclosed are N-heterocyclic carbene (NHC) and 4-pyridinol-derived pincer ligands and metal complexes containing these ligands. These compounds can be used to photocatalyticaly reduce CO.sub.2 to CO.